I can't believe this question is even coming up. Keep a 50/50 ratio of regular coolant inside the vehicle and change on a yearly basis and you will be fine. Don't purchase the prediluted mix, but mix it full strength along with distilled water. Regular water has minerals that are not pure enough coming out of the tap or hose.
On a Honda Accord the coolant temperature sending unit is on the passenger side of the upper engine. It is next to the cylinder head.
Freeze plugs on a 93 Honda Accord are located along the front and sides of the engine block. They are designed to prevent the engine from being cracked in the event the coolant completely freezes.
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The water temperature sensor on your 1991 Honda accord, is located on the front of the engine. The sensor is above the water thermostat housing.
The 2011 Honda Accord has an inline 4 engine.
The 2005 Honda Accord has an inline 4 engine.
The 2003 Honda Accord has an inline 4 engine.
The 2006 Honda Accord has an inline 4 engine.
The 2004 Honda Accord has an inline 4 engine.
The 2007 Honda Accord has an inline 4 engine.
The 2014 Honda Accord has an inline 4 engine.
The 2008 Honda Accord has an inline 4 engine.